Possibly the pivot bolt for the vent in front of the windshield?
Wayne 1938 1-Ton Farm Truck Stovebolt Gallery Forums 1989 Silverado 1996 Mustang GT convertible When I die, I hope she doesn't sell everything for what I told her I paid for it!
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
If it's oily, it's likely the bolt that holds the oil pump in place. It would have a jam nut on it as well. Here's a pic of a 235 I was tearing down. The 216 has the same retaining bolt (2nd Pic.)
Last edited by klhansen; 03/05/202611:04 PM. Reason: added 2nd picture
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
I'd say Kevin has this one pegged. Here's a screen shot from a Chevy Master Parts Book showing the exploded view of the earlier oil pump with the retaining bolt and associated hardware. Good catch Kevin!
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
I may have a spare I can measure. I'll look in the morning.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
I may have a spare I can measure. I'll look in the morning.
Don't have an extra. Sorry. It went away with the engine, apparently. I'm pretty sure that it is the oil pump retaining screw, contrary to what Carl says. I think the tip shape doesn't matter, It just depends on the diameter of the pin where it goes into the blind hole in the oil pump. If someone has an engine that's partially torn down they could measure to confirm.
Last edited by klhansen; 03/08/20268:39 PM. Reason: fixed spelling
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
The oil pump setscrew has a bigger thread, 7/16, I believe, and the tip has a taper, not a stepped down round tip. The jam nut has a 5/8" wrench size. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Do you have one to confirm that Jerry? My recollection is that the hex head was a 1/2", which would indicate a 5/16" thread. The jam nut is larger, I'm recalling 9/16" hex. And I do think that the tip is stepped down to match the blind hole in the oil pump.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
It looks very similar to a couple of bolts that hold the plate down on the top shifting 3 speed trans. The small extension goes down into a rod in the trans. I have a spare trans I can pull the bolts out tonight and compare.
1947.2 GMC 1/2T SWB panel 1947.2 GMC 1/2T long bed 1948 GMC 1/2T short bed
Do you have one to confirm that Jerry? My recollection is that the hex head was a 1/2", which would indicate a 5/16" thread. The jam nut is larger, I'm recalling 9/16" hex. And I do think that the tip is stepped down to match the blind hole in the oil pump.
Yes, I have several engines in various stages of disassembly. I will take a few pictures, along with thread diameter and pitch measurements in the daylight tomorrow. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!
Rich, are you just saying it threads into the shifter plate? Did it come from the oil pump bracket? I don't know of any other bolt that has the pin end.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
